A square wire loop of \( 10.0 \mathrm{~cm} \) side lies at right angles to a uniform magnetic fi....

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A square wire loop of \( 10.0 \mathrm{~cm} \) side lies at right angles to a uniform magnetic field of \( 20 \mathrm{~T} \). A \( 10 \mathrm{~V} \)
P
light bulb is in a series with the loop as shown in the fig. The magnetic field is decreasing steadily to zero over a time interval \( \Delta \mathrm{t} \). The bulb will shine with full brightness of \( \Delta t \) is equal to
(1) \( 20 \mathrm{~ms} \)
(2) \( 0.02 \mathrm{~ms} \)
(3) \( 2 \mathrm{~ms} \)
(4) \( 0.2 \mathrm{~ms} \)


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